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प्रश्न
Writing a chemical reaction in brief by using chemical formulae is called as _______.
पर्याय
chemical change
chemical symbol
chemical equation
chemical reaction
उत्तर
Writing a chemical reaction in brief by using chemical formulae is called as chemical equation.
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संबंधित प्रश्न
What does the symbol (aq) represent in a chemical equation?
How will you indicate Endothermic reaction in a chemical equation?
Translate the following statement into chemical equation and then balance the equation:
Aluminium metal replaces iron from ferric oxide, Fe2O3, giving aluminium oxide and iron.
Balance the given equation:
Mg(OH)2 + HCI MgCI + H2O
Write balanced chemical equation from the following information:
An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.
Balance the following chemical equation:
MnO2 + HCI → MnCI2 + CI2 + H2O
Write the balanced equations for the following reaction, and add the state symbols:
Magnesium carbonate reacts with hydrochloric acid to produce magnesium chloride, carbon dioxide and water.
What is meant by chemical reaction? Explain with the help of an example.
Give one example of a chemical reaction characterised by change in state.
A metal X forms a salt XSO4. The salt XSO4 forms a clear solution in water which reacts with sodium hydroxide solution to form a blue precipitate Y. Metal X is used in making electric wire and alloys like brass.
(a) What do you think metal X could be?
(b) Write the name, formula and colour of salt XSO4.
(c) What is the blue precipitate Y?
(d) Write a chemical equation of the reaction which takes place when salt XSO4 reacts with sodium hydroxide solution. Give the state symbols of all the reactants and products which occur in the above equation.
Name the type of chemical reaction shown by the following equation:
2Mg+ O2 → 2MgO
Balance the following chemical equation :
FeS + HCl → FeCl2 + H2S
Write symbolic representation for the following word equation and balance them :
Iron + Sulphur → Iron sulphide.
While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made following measurements:
Mass of water in the beaker = 40 g
Mass of raisins before soaking = 5 g
Mass of raisins after soaking for 2 hours = 8 g
Mass of water left in the beaker after the experiment = 35 g
The percentage of water absorbed by raisins is:
Balance the equation stepwise.
H2S2O7(l) + H2O(l) → H2SO4(l)
Write down what you understood from the following chemical reaction.
AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)
Write the chemical equation for the following word equation and balance them.
Calcium + Nitrogen → Calcium nitride
Balance the following equation:
MnO2 + HCl → MnCl2 + H2O + Cl2
Name the fundamental law that is involved in every equation.
Write the balanced chemical equation of the following reaction.
copper + nitric acid → copper nitrate + nitric oxide + water
Write the balanced chemical equation of the following reaction.
ammonia + oxygen → nitric oxide + water
Write the balanced chemical equation of the following reaction.
barium chloride + sulphuric acid → barium sulphate + hydrochloric acid
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate mass of MnO2 used.
(a) Give only one suitable chemical test to identify the following gases.
- Ammonia
- Sulphur dioxide
- Hydrogen Chloride
- Chlorine
- Carbon Dioxide
- Oxygen
- Hydrogen
(b) Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?
(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?
(d) State the gas responsible for bleaching action.
(e)Which gas turn blue cobalt chloride paper light pink?
What is thermit process? Where is this process used? Write a balanced chemical equation for the reaction involved.
A student mixes sodium sulphate powder in barium chloride powder. What change would the student observe on mixing the two powders? Justify your answer and explain how he can obtain the desired change.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – mercury [II] oxide.
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
What is the indications of the arrow between the reactants and the products and of the arrow pointing downwards at the end.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
Pb(NO3)2 + 2NH4OH → 2NH4N03 + Pb(OH)2↓
Give an example of a chemical equation in which two reactants form:
two product
Balance the following simple equation:
FeCl2 + Cl2 → FeCl3
Give a balanced equation by partial equation method, [steps are given below].
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- Ammonia first reacts with chlorine to give hydrogen chloride and nitrogen.
- Hydrogen chloride then further reacts with excess ammonia to give ammonium chloride.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
CaC2 + N2 → 2CaCN2 + C
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
C2H5OH + 3O2 → 2CO2 + 2H2O
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
2H2O + 2Cl2 → 2HCl + O2
Write scientific reason.
Adding zinc particles to a solution of copper sulphate makes the blue solution colorless.
What are products? Explain with the help of example.
Write three steps of writing chemical equations with example?
The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the following types of reaction?
Which of the following is the correct observation of the reaction shown in the above set up?
